cises and job performance. She reported validities of .41 to .48 for a recent study conducted by her firm (SH&A/Fenestra, 2007) and .43 for a study by Byham (2010). Her review of the research indicates that assessment center results show incremental validity over personality tests, cognitive tests, and interviews.
One advantage of assessment center methods is they appear not to have adverse impact on minority groups. Collins said research documents that they tend to be unbiased in predictions of job performance. Further, they are viewed by participants as being fairer than other forms of assessment, and they have received positive support from the courts and the Equal Employment Opportunity Commission (EEOC).
Assessment centers can be expensive and time intensive, which is one of the challenges associated with using them. An assessment center in a traditional paradigm (as opposed to a high-tech paradigm) can cost between $2,500 and $10,000 per person. The features that affect cost are the number of assessors, the number of exercises, the length of the assessment, the type of report, and the type of feedback process. They can be logistically difficult to coordinate, depending on whether they use a traditional paradigm in which people need to be brought to a single location as opposed to a technology paradigm where much can be handled remotely and virtually. The typical assessment at a center lasts a full day, which means they are resource intensive and can be difficult to scale up to accommodate a large number of test takers.